Casing-elevator.



no. 670,704. Patented Mar. 25, l9 0l. u. .1. DAVIN.

CASING ELEVATOR.

( Application filed Nov. 16, 1900.)

(No Model.)-

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UNITED STATES JAMES JOSEPH DAVIN, OF WASHINGTON, PENNSYLVANIA.

CASING-ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 670,704, dated March 26, 1901.

Application filed November 16, 1900. Serial No. 36,721. (No model-L T0 (ti/Z whom. it may concern.-

Be it known that I, JAMES JOSEPH DAVIN, a citizen of the United States, and a resident of Washington, in the county of Washington and'State of Pennsylvania, have invented a new and Improved Casing-Elevator, of which the following is a full, clear, and exact description.

This invention relates. to improvements in elevators for casings in oil-wells or the like.

As is well known, the ordinary casing-elevator consists of a collar made in two sections hinged together, a bail attached to the hinged side, and a bail attached to the opposite or free side, with which a locking-link is connected and is designed to drop into a notch. When the casing-hook is'adjusted to the bails for the purpose of pulling a joint or joints, an unavoidable lost motion takes place. Then as the hoisting-engine is suddenly started the lost motion is taken up; but at this time another motion takes place-namely, a horizontal swaying until gravity stops it. During the swaying motion the front bail or that attached to the free side reaches the point where its locking-link seeks its recess and is overhead, and the consequence is a different center for the strain is found and one side of the casing-collar bears all the strain or pulls off the casing, which falls down the well, causing considerable expense and possible abandonment of the well.

The object of my invention is to obviate the above-mentioned dangers and difficulties by so constructing the parts that the bail cannot become locked in its outer position; but the swaying motion is permitted until it is stopped by gravity.

I will describe a casing-elevator embodying my invention and then point out the novel features in the appended claim.

Reference is to be had to the accompanying drawings, forminga part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of a casing-elevator embodying my invention. Fig. 2 is a side elevation with the bails removed, and Fig. 3 is a top plan view.

The elevator comprises a collar consisting of two sections 1 2, hinged together at one side, as at 3, and having overlapping outer projections at 5 at the opposite side. A bail 6 has its lower ends turned inward and seated in holes 7, formed in the hinge-wings, and a front bail 8 has its lower ends turned inward and seated in openings in the projections 4 and 5. The upper edges of the projections 4 and 5 have each an upwardly-extended guardliig 9, and between this guard-lug and the collar the upper edges of said projections are inclined downward and outward, as at 10. A locking-link 11 embraces the bail 8 and also engages around the outer sides of the lugs 9, the link engaging around the outer and inner sides of the members of theloail 8, and the portion 12 of said link between the members or sections of the bail is curved outward and rests or is engaged with and slides upon the incline 10. At the sides outward of the bail members the link is curved inward, as at 13, and the outer end is designed to engage closely against the outer side of the lug or lugs 99.

In operation the elevator-collar is to be engaged around a casing, (indicated by w in Fig.

1,) and then after engaging the hooking-tackle with the bails the hoisting motion is started, and, as before stated, there will be a slight lost motion-that is, the bail 8 will swing outward, as will also the link 11. This link ll will slide down the incline 10, as indicated by dotted lines in Fig. 2, and therefore as there is no notch to receive it, as in the usual con- Thus it will be seen that there will collar at the hinged side, a lug extended up- In testimony whereof I have signed my ward from the said projections, an incline extending from the collar to said lug, and a locktwo subscribing witnesses. ing-link engaging around the first-named bail 5 and around the lug and adapted to slide on said incline by its engagement with the bail, substantially as specified.

name to this specification in the presence of i JAMES JOSEPH DAVIN.

Witnesses:

T. J EFF. DUNCAN,

BOYD E. WARNE. 

